I love the game, It's addicting and fun, a shame that it's very short and you can only do so little, but I understand that it's in VERY early development, this game have big potential and I can't wait until it gets more updates!

So, of course, you'll start with a new character. That character fights 10 levels, but on the 10th level, it will be VERY hard to beat, so then once you're trying to beat the level after a few mins, the two characters from the last two chapters will come from where they were last chapter, and help the player beat the level. When they are done beating the level. The run off somewhere else to plan something to help the humans.

That was what I got so far. I hope you liked the suggestion!-DragonRaider12